1) People who live in areas with high magnetic fields. The Environmental Protection Agency (EPA) has labeled magnetic fields as a class 3 carcinogen, and protection is necessary in order to avoid potential health risks caused by exposure.
2) Businesses that use electronics. Magnetic fields can cause severe interference with electronic devices, and so shielding is recommended to prevent damage or loss of equipment.
The main sources for low frequency magnetic fields are high-power transmission lines, electrical poles near a home or business, electrical wires and household appliances.
The typical method for shielding against EMR (electromagnetic radiation) is ineffective in the case of magnetic fields. Instead, the best approach is the use of high magnetic permeability metal alloys, such as those made from an amorphous cobalt alloy.
It is not possible to completely block or eliminate a magnetic field. Instead, our materials protect by redirecting the field around the shielded area or object. The best shape for a magnetic shield is thus a closed container which completely surrounds the shielded volume. Shields will often consist of several enclosures, one inside the other, each of which will successively reduce the intensity of the magnetic field.